First, let me apologize in advance for being that guy.
While you clearly said you had no intent on making the raid team more hardcore, it certainly does sound like it. Or at the very least, leaning towards "less casual". I have no problem trying that again, despite how it went last time, but do keep in mind that some of our raiders are limited in time and rarely login when it's not raid days. While helping with rotation and class research is fine, it's only a small step before forcing a minimal amount of world quests to be done to maximize artifact power or, as Snugg suggested already, dedicating a day to pushing Mythic + for optimal gear. I'm afraid that would alienate some of the raiders who tend to be more casual.
As for myself, I'm always willing to do old raid and other stuff outside of raid days.*
* As long as it doesn't include parkour races.